单项选择题

A cargo boom is a（）.

A.double sized mattress consists of more than 890 coils
B.spar extending from a mast or a king post
C.flap（Becker rudder）can be fitted to the rudder’s trailing edge
D.bridle arrangement having a long beam of the length of the container

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单项选择题

A 6x19 wire rope would be（）.

A.6 inches in diameter and 19 fathoms long
B.6 inches in circumference with 19 strands
C.6 strands with 19 wires in each strand
D.19 strands with 6 wires in each strand

单项选择题

A 6x12，two-inch wire rope has（）.

A.12 strands and a two-inch diameter
B.12 strands and a two-inch circumference
C.6 strands and a two-inch diameter
D.6 strands and a two-inch circumference

单项选择题

A “sheepshank” is used to（）.

A.keep a line from fraying
B.join lines of unequal size
C.stop off a line
D.shorten a line